[A strike]

Apparently you’re the one smelling every one of Trump’s ‘brain farts’.

Making a profit is not a National Security interest.

[nathanbedford]

You asked: What exactly is the U.S. national security interest in Ukraine, jackA ?

The answer for Trump is clear: making a profit by selling arms to Ukraine.

The other reasons listed go to maintaining credibility to maintain deterrence to avoid going to war over Taiwan. These are our national interests, Trump's profit-making over a war that he says he deplores because of the loss of life, is a (hypocritical) national interest- in his mind, at least.